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TSample = class(TPersistent) private a: integer; public procedure Assign(source : TPersistent); override; end; var Form1: TForm1; implementation {$R *.dfm} function CopyObject(Src,Dest : TObject; Related : Boolean = FALSE) : Boolean; var Mem : Pointer; Size : Integer; begin if(NOT Assigned(Src)) OR (NOT Assigned(Dest)) then begin Result := FALSE; Exit; end; if(NOT Related)OR (Src.InheritsFrom(Dest.ClassType)) OR (Dest.InheritsFrom(Src.ClassType)) then begin if Src.InstanceSize < Dest.InstanceSize then Size := Src.InstanceSize else Size := Dest.InstanceSize; Dec(Size,4); { opuszczamy pierwsze 4 bajty tablicy } GetMem(Mem,Size); if Size < Dest.InstanceSize then System.FillChar(PByteArray(Dest)^[4],Size,0); System.Move(PByteArray(Src)^[4],PByteArray(Dest)^[4],Size); FreeMem(Mem); Result := TRUE; end else Result := FALSE; end; procedure TSample.Assign(source : TPersistent); begin if NOT CopyObject(Source,Self,TRUE) then inherited Assign(Source); end; procedure TForm1.Button1Click(Sender: TObject); var S1, S2 :TSample; begin S1 := TSample.Create; S1.a := 1; S2 := TSample.Create; S2.Assign(S1); S2.a := 10; caption := inttostr(S1.a); end; |
Autor: Nakiel